After upgrades (I'm not sure whether it happened after jenkins or jenkins plugin upgrade), jenkins doesn't set configured environment variables with default values in the "This build is parameterized" section on commit notification from SCM (Stash) using /git/notifyCommit request. However it works properly when build is manually triggered with "Build with parameters" button. The only difference I can see is the lack of these configured variables set – everything else works as expected.

It is a regression – this setup is used for a very long time in our environment.